What is a .SIG File And How To Open It (Easy Steps)


Have you downloaded a file with .sig extension, but you have never seen this extension before? You most likely know what the file is, but you might be unsure on how to open it. In this article we will explain what .sig file extension is, how to open it and how to work with it.

What is a .SIG file?

The file extension .SIG is Signature File. The format of this file is text, and it is a text related file.

What to know

There is currently 1 software that can open the .sig file on 1 platform.

How to open a .SIG file?

In this part of the article we will show you how to open the .SIG file on various operating systems.

How to open a .SIG file on Windows (7, 8, 10)

We have written below an easy-to-understand guide on how to open the .sig file on Windows in 4 easy steps.

1. In the first step you need to download the Microsoft Outlook 365 software. You will be using this software in order to open the file. Other software that can be used in opening this file is: Microsoft Outlook 365.

Step 2

Step 2: Locating your .SIG file

2. The second step is locating the downloaded file. The file can be usually found in your /download/ folder if you don’t remember where you have downloaded it to.

Step 3

Step 3: Choose “Open with”

3. In the third step, after locating your file, right click on it and click “Open with”.

Step 4

Step 4: Choose the software and click ok

4. In the fourth step, after clicking “Open with”, you should see the Microsoft Outlook 365 software that you have downloaded. Click on the software and click “OK”. That’s all, now you have opened your file on Windows.

Still cannot open the .SIG file?

If you are still unable to open the .SIG file, it might be because you are trying to open the wrong one. The .SIG file extension is similar to other file extensions such as: .sig – Broderbund, .sig – Duxbury Systems. You might be trying to open one of them. Please recheck the file extension again.


In this article you have learned how to open the .SIG file with the Microsoft Outlook 365 program on Windows.